Rules For Fractions Page 2
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1
2tudent
S
Rules for fractions
earning
L
entre
C
#
Explanation
Workings
Answer
34
+
+
2
4
2 3
4 7
=
21
7
3
7(3)
3(7)
Before you can add or subtract, the fractions should have the
=
1.
same bottom number – a Common Denominator.
5
×
=
3
5
3×5
15
=
8
4
6
4×6
24
Multiply the bottom numbers and multiply the top numbers.
=
2.
Then simplify the fraction by cancelling by 3
21
÷
=
×
=
7
2
7
3
7×3
=
24
12
3
12
2
12×2
Turn the second fraction upside down and multiply. 21 and 24
3.
have a common factor of 3, so divide top and bottom by 3.
−
=
−
7
3
14
9
5
=
12
8
24
24
24
Before you can add or subtract, the fractions should have the
4.
same bottom number – a Common Denominator.
S
L
C
TUDENT
EARNING
ENTRE
R
B
A
EGISTRY
UILDING
NNEXE
T
: 61-8-8201 2518
EL
E-
:
slc@flinders.edu.au
MAIL
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:
NTERNET
P
: PO B
2100, A
, SA 5001
OSTAL
OX
DELAIDE
Rules of Fractions
5/2013 @ SLC
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